MAX8722C Ver la hoja de datos (PDF) - Maxim Integrated

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MAX8722C

Low-Cost CCFL Backlight Controller

Maxim Integrated 

Low-Cost CCFL Backlight Controller

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1. VBATT = 12V, VCC = VDD, VSHDN = 5.4V, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.)

PARAMETER

SYNC Input Frequency Range

CNTL Input Voltage Range

CNTL Input Current

DPWM ADC Resolution

SHDN Input Low Voltage

SHDN Input High Voltage

SHDN Input Bias Current

FREQ Input Regulation Level

FREQ Input Bias Current

TFLT Charge Current

TFLT Trip Threshold

CONDITIONS

0 < VCNTL < VCC

Guaranteed monotonic

FREQ = VCC

VISEC < 1.25V and VIFB < 600mV; VTFLT = 2V

VISEC < 1.25V and VIFB > 600mV; VTFLT = 2V

VISEC > 1.25V and VIFB < 600mV; VTFLT = 2V

MIN TYP MAX UNITS

20

100

kHz

0

2.0

V

-0.1

+0.1

μA

7

Bits

0.8

V

2.1

V

-1

+1

μA

VCC/2

V

230

μA

0.95 1.00 1.10

-1

μA

120

3.95 4.10 4.20

V

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1. VBATT = 12V, VCC = VDD, V SHDN = 5.4V, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)

PARAMETER

BATT Input Voltage Range

BATT Quiescent Current

BATT Quiescent Current,

Shutdown

CONDITIONS

VCC = VDD = VBATT

VCC = VDD = open

VSHDN = VCC, VIFB = 1V

VBATT = 28V

VBATT = VCC = 5V

SHDN = GND

VCC Output Voltage, Normal

Operation

VCC Output Voltage, Shutdown

VCC Undervoltage-Lockout

Threshold

GH1, GH2, GL1, GL2

On-Resistance, High

VSHDN = 5.5V, 6V < VBATT < 28V

0 < ILOAD < 20mA

SHDN = GND, no load

VCC rising (leaving lockout)

VCC falling (entering lockout)

ITEST =10mA, VCC = VDD = 5.3V

GH1, GH2, GL1, GL2

On-Resistance, Low

ITEST =10mA, VCC = VDD = 5.3V

BST1, BST2 Leakage Current

Resonant Frequency Range

Minimum Off-Time

Maximum Off-Time

VBST_ = 12V, VLX_ = 7V

Guaranteed by design

Current-Limit Threshold

LX1 - PGND, LX2 - PGND (Fixed)

ILIM = VCC

MIN TYP MAX

4.6

5.5

5.5

28.0

2

2

26

5.25

5.50

3.5

5.5

4.55

3.80

24

12

5

30

80

360

620

23

43

190

230

UNITS

V

mA

μA

V

V

V

μA

kHz

ns

μs

mV

4 _______________________________________________________________________________________

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